A Windows program to calculate aspects between planets at a given date (current date or birthdate). Also displays personal transits for either of two birthdates, and synastry for two birthdates. Has graphical and dynamical displays which show how transits change over time, and how the position of a transiting planet changes with respect to a natal planet. Supports both tropical and sidereal zodiacs. Detects aspect patterns as well as aspects, and allows search for aspect patterns such as grand trines, kites, yods and grand crosses. Graphical display of world transits, natal charts, personal transits and synastry can all be saved as PNG files. Aspect colors are user-selectable, and in the graphical display aspects can be turned on or off. There is an option to suppress display of aspects which include any of the inner planets, so as just to study the aspects formed by the outer planets.